<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--登录表单区-->
      <el-form label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules" ref="loginFormRef">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <!--按钮区-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="restLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    name: "Login",
    data () {
      return {
        // 这是登录表单的绑定对象
        loginForm: {
          username: "admin",
          password: "123456"
        },
        // 这是表单的验证规则对象
        loginFormRules: {
          // 验证用户名是否合法
          username: [
            {
              required: true,
              message: "请输入登录用户名",
              trigger: "blur"
            },
            {
              min: 3,
              max: 10,
              message: "长度在 3 到 10 个字符",
              trigger: "blur"
            }
          ],
          // 验证密码是否合法
          password: [
            {
              required: true,
              message: "请输入用户密码",
              trigger: "blur"
            },
            {
              min: 6,
              max: 15,
              message: "长度在 6 到 15 个字符",
              trigger: "blur"
            }
          ]
        }
      };
    },
    methods: {
      restLoginForm () {
        console.log(this);
        this.$refs.loginFormRef.resetFields();
      },
      login () {
        this.$refs.loginFormRef.validate(async valid => {
          if (!valid) return this.$message.error("验证无法通过");
          const { data: res } = await this.$http.post("login", this.loginForm);

          if (res.meta.status != 200) {
            return this.$message.error("登录失败");
          }
          console.log(res);
          this.$message.success("登录成功!");
          // 1.将登录成功后的token保存在客户端sessionStorage中
          // 1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
          // 1.2token只应该在当前网站打开期间生效，所以必须将token 保存在sessionStorage 中.
          window.sessionStorage.setItem("token", res.data.token);

          // 2. 通过编程式导航跳转到后台主页，路由地址式 ： /home
          this.$router.push("/home");
        });
      }
    }
  };
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }

</style>
